Clay Minerals And Biology Combined Remediation For Contaminated Soil With Heavy Metals

The purpose of this paper is to treat heavy metal contaminated soil and repair the damaged ecological environment. We used the on-site heavy metal contaminated acid soil as the study object and added with Sedum alfredii H and maize as auxiliary material and treated with clay minerals and mycorrhizal and conducted research on treatment technology and mechanism of the zinc-lead-cadmium contaminated soil. The study result shows that clay minerals has selective tendency to absorb mixed heavy metal by ion exchange and surface complex methods. The study also demonstrates that adding sepiolite in soil can decrease heavy metal concentration in body of plants, improve the plant absorption of the nutrition elements like calcium and Phosphate, and increase the soil PH level. Moreover there is negative relationship between the soil PH value and plant body heavy metal concentration. The soil PH value has negative relationships between with soil exchangeable heavy metal and positive relationship with other soil heavy metal form.Adding sepiolite can degrade the three exchangeable heavy metals and stabilize the heavy metal treatment effect especially when soil is contaminated by the multiple heavy metals. Adding fungus root can help the heavy metal's abstraction and treatment.by improving the heavy metal absorption in plants. The join remedy effect of sepiolite and mushroom root will significantly increase the numbers Sedum alfredii H and its nutrition of phosphate. This study finally concludes the'stabilization first and abstraction second'soil heavy metal remedy in soil can help accelerate the recovery of heavy metal contaminated soil and restoration the ecological environment.